20389039 has 4 divisors (see below), whose sum is σ = 22242600. Its totient is φ = 18535480.

The previous prime is 20389027. The next prime is 20389049. The reversal of 20389039 is 93098302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20389039 - 2⁵ = 20389007 is a prime.

It is a super-2 number, since 2×20389039² = 831425822687042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20388995 and 20389013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 926764 + ... + 926785.

It is an arithmetic number, because the mean of its divisors is an integer number (5560650).

Almost surely, 2^20389039 is an apocalyptic number.

20389039 is a deficient number, since it is larger than the sum of its proper divisors (1853561).

20389039 is a wasteful number, since it uses less digits than its factorization.

20389039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853560.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20389039 is about 4515.4223501241. The cubic root of 20389039 is about 273.1904953009.

The spelling of 20389039 in words is "twenty million, three hundred eighty-nine thousand, thirty-nine".